logic

1[uncountable]a way of thinking or explaining somethingI fail to see the logic behind his argument.The two parts of the plan were governed by the same logic.

2[uncountable,singular]sensible reasons for doing somethingLinking the proposals in a single package did have a certain logic.a strategy based on sound commercial logicThere is no logic to/in any of their claims.

3[uncountable](philosophy)the science of thinking about or explaining the reason for something using formal methodsthe rules of logic

4[uncountable](computing)a system or set of principles used in preparing a computer to perform a particular task